Question

if ABCD is a cyclic quadrilateral in which ab parallel BC prove that angle b = angle C

Answer 1

Angle a + Angle b =180

[Adjacent angles between parallel line are supplementary]

Angle a + Angle c = 180

[Opp angles of cyclic quad are supplementary]

Angle a + Angle b = Angle a + Angle c

                Angle b  = Angle c

Answer 2

Answer:

HOPE IT WILL HELP YOU:-